Physics, Chemistry and Biology: Post your doubts here!

[IGCSE O/L student]

Does anyone have the marking scheme of the physics IGCSE October November 2006 Paper 1? The link on xtreme is for GCE A level , and I can't find any on the internet :/

here's da link: http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w06_ms_1.pdf

 

[Rania MD]

No that's the wrong link, the title is GCE AS LEVEL I need the IGCSE

 

[IGCSE O/L student]

No that's the wrong link, the title is GCE AS LEVEL I need the IGCSE

sry, but i dont hv it

 

[za Shadow]

what does this sentence mean "the 2 Ω resistor is shorted out with a thick piece of wire" ??????

 

[IGCSE O/L student]

what does this sentence mean "the 2 Ω resistor is shorted out with a thick piece of wire" ??????

it means da resistor is replaced

 

[kainat husain]

I dunno about Q18.
For question 27 it's D because copper is not ferrous, meaning it cannot be magnetized easily since it contains no iron.
For 29 the answer is not D because the batteries are not connected in parallel. There side by side, not one over each other. It's A as it is a series circuit, and in B the batteries are connected wrong.
For 36.. what the hell ?

thank you soo much zain well thn i'll ask sum one else about those 2 questions! well thanks a lot jazakALLAH khair

 

[kainat husain]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w09_qp_12.pdf
question 18 and 36

 

[za Shadow]

it means da resistor is replaced

THANKS

 

[IGCSE O/L student]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w09_qp_12.pdf
question 18 and 36

question 18: wen u cool da water at X, da water molecules at X becum more dense and so sink, displacin less dense molecules
question 36: u need rays, so u use d.c. a.c produces lines. u use 600V coz dis is done in a vacuum where dere r no air molecules

 

[kainat husain]

can some one explain time delay circuit and capacitor please in simple words pleassee!

 

[IGCSE O/L student]

THANKS

nytym, ask me wenevr u require assistance

 

[IGCSE O/L student]

can some one explain time delay circuit and capacitor please in simple words pleassee!

a capacitor is an electrical device used to store energy temporarily. it charges up wen current is flowin, n dicharges wen current is not flowin.
i'v got no idea wat a time-delay circuit is, sry

 

[ZainH]

can some one explain time delay circuit and capacitor please in simple words pleassee!

Your welcome! Since someone already explained capacitor , I'll explain time-delay circuit.
If you understand what a capacitor does , time-delay circuits are easy. Basically..in this circuit there is a variable resistor. If you increase the resistance of this resistor the charge flowing through the capacitor decrease causing it to charge up more slowly. This INCREASES the time-delay. If resistance is decreased then more charge flows, the capacitor charges up more quickly and the time-delay is DECREASED. It's actually pretty simple x)

 

[kainat husain]

a capacitor is an electrical device used to store energy temporarily. it charges up wen current is flowin, n dicharges wen current is not flowin.
i'v got no idea wat a time-delay circuit is, sry

thank you so much dear! jazak ALLAH khair

 

[kainat husain]

Your welcome! Since someone already explained capacitor , I'll explain time-delay circuit.
If you understand what a capacitor does , time-delay circuits are easy. Basically..in this circuit there is a variable resistor. If you increase the resistance of this resistor the charge flowing through the capacitor decrease causing it to charge up more slowly. This INCREASES the time-delay. If resistance is decreased then more charge flows, the capacitor charges up more quickly and the time-delay is DECREASED. It's actually pretty simple x)

oo yea thank you i understood now! thanks for the help and do u have nay idea about potential divider and potentiometer?

 

[Someone2]

hey ppl...
ques# 14 in may june 2011 Paper 12... I DONT GET IT!! plz explain it 2 me!!

 

[always-smile :)]

hey ppl...
ques# 14 in may june 2011 Paper 12... I DONT GET IT!! plz explain it 2 me!!

since the level of mercury is the same in both tubes then the pressure on the 2 point is the same

 

[always-smile :)]

plllz nov. 2006 q3 ... why b not d ???

 

[kainat husain]

URGENT HELP NEEDED! PLEASE SOME ONE SOLVE THESE FOR ME
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s10_qp_33.pdf
question 2a (i) and (ii)
question 6 (a)
and question 6 (F) how will i draw please explain!
question 8 whole question i dunno how to do
question 9 b- y is it not 22 ohms? and (ii)
question 10 a and b! please some one help!

 

[GetSomeLife]

hey ppl...
ques# 14 in may june 2011 Paper 12... I DONT GET IT!! plz explain it 2 me!!

The levels of mercury are what shows the atm pressure. At X and Y, the pressure is same despite the different the thickness of the tube. Remember that in liquids the pressure only depends upon the density of the material and height! So, thickness has no effect